[PATCH 4/7] dmaengine: omap-dma: Dynamically allocate memory for lch_map

Peter Ujfalusi
2016-07-14T12:42:39Z

On OMAP1 platforms we do not have 32 channels available. Allocate the
lch_map based on the available channels. This way we are not going to have
more visible channels then it is available on the platform.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
---
drivers/dma/omap-dma.c | 20 ++++++++++++++------
1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/drivers/dma/omap-dma.c b/drivers/dma/omap-dma.c
index 6d134252ed61..c026642fc66a 100644
--- a/drivers/dma/omap-dma.c
+++ b/drivers/dma/omap-dma.c
@@ -35,7 +35,7 @@ struct omap_dmadev {
unsigned dma_requests;
spinlock_t irq_lock;
uint32_t irq_enable_mask;
- struct omap_chan *lch_map[OMAP_SDMA_CHANNELS];
+ struct omap_chan **lch_map;
};

struct omap_chan {
@@ -1223,16 +1223,24 @@ static int omap_dma_probe(struct platform_device *pdev)
spin_lock_init(&od->lock);
spin_lock_init(&od->irq_lock);

- od->dma_requests = OMAP_SDMA_REQUESTS;
- if (pdev->dev.of_node && of_property_read_u32(pdev->dev.of_node,
- "dma-requests",
- &od->dma_requests)) {
+ if (!pdev->dev.of_node) {
+ od->dma_requests = od->plat->dma_attr->lch_count;
+ if (unlikely(!od->dma_requests))
+ od->dma_requests = OMAP_SDMA_REQUESTS;
+ } else if (of_property_read_u32(pdev->dev.of_node, "dma-requests",
+ &od->dma_requests)) {
dev_info(&pdev->dev,
"Missing dma-requests property, using %u.\n",
OMAP_SDMA_REQUESTS);
+ od->dma_requests = OMAP_SDMA_REQUESTS;
}

- for (i = 0; i < OMAP_SDMA_CHANNELS; i++) {
+ od->lch_map = devm_kcalloc(&pdev->dev, od->dma_requests,
+ sizeof(*od->lch_map), GFP_KERNEL);
+ if (!od->lch_map)
+ return -ENOMEM;
+
+ for (i = 0; i < od->dma_requests; i++) {
rc = omap_dma_chan_init(od);
if (rc) {
omap_dma_free(od);
--
2.9.1